Datasheet Summary
19-0777; Rev 1; 10/07
600mA/650mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power
General Description
The MAX8805W/MAX8805X/MAX8805Y/MAX8805Z high-frequency step-down converters are optimized for dynamically powering the power amplifier (PA) in WCDMA or NCDMA handsets. The devices integrate a high-efficiency PWM step-down converter for mediumand low-power transmission, and a 60m Ω typical bypass FET to power the PA directly from the battery during high-power transmission. Dual 200mA low-noise, high-PSRR low-dropout regulators (LDOs) for PA bias.. ing are also integrated. Two switching frequency options are available (2MHz for the MAX8805W/MAX8805Y and 4MHz...